Whether the bearing is installed well or not will affect the accuracy, life and performance of the bearing. Therefore, please fully study the bearing installation, that is, please install the bearing according to the operating standards including the following items. 1. Cleaning of bearings and related parts Oil seals or dust caps are provided for grease-lubricated bearings and both sides, and there is no need to clean the bearings with sealing rings before installing them.

Second, the size and finishing of the beak and beak

Third, the installation method The installation of the bearing should be determined according to the bearing structure, size and the matching nature of the bearing parts. The pressure should be directly applied to the end face of the ferrule with the tight fit, and the pressure should not be transmitted through the rolling elements. The bearing installation generally adopts the following methods: a. Press-fit the inner ring of the bearing and the shaft to make a tight fit, and the outer ring When it is loosely fitted with the bearing seat hole, the bearing can be press-fitted on the shaft first, and then the shaft together with the bearing is put into the bearing seat hole. For the assembly sleeve (copper or mild steel), the inner diameter of the assembly sleeve should be slightly larger than the diameter of the journal, and the outer diameter should be slightly smaller than the rib of the inner ring of the bearing to avoid pressing on the cage. The outer ring of the bearing is tightly fitted with the shaft hole. When the inner ring and the shaft are loosely fitted, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time.

b. Heating fit is an installation method in which a tight fit is transformed into a loose fit by heating the bearing or housing by thermal expansion. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before hot-loading, put the bearing or the ferrule of the separable bearing into the oil tank and evenly heat it at 80-100°C, then take it out of the oil and install it on the shaft as soon as possible. To prevent the end face of the inner ring and the shaft shoulder from not fitting tightly after cooling, after the bearing is cooled, it can be re-fitted by heating the bearing seat. , to avoid scratches on the mating surface. When heating the bearing with the oil tank, there should be a mesh grid at a certain distance from the bottom of the box, or hang the bearing with a hook. The bearing cannot be placed on the bottom of the box to prevent heavy impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank. Strictly control the oil temperature over 100℃ to prevent the tempering effect and reduce the hardness of the ferrule. c. Installation of tapered bore bearings Tapered bore bearings can be directly mounted on the tapered journal, or on the tapered surfaces of the adapter sleeve and the withdrawal sleeve. The tightness of the fit can be determined by the reduction in the radial clearance of the bearing. Therefore, the radial clearance of the bearing should be measured before installation. During the installation process, the clearance should be measured frequently to achieve the required clearance reduction. Generally, the lock nut is used for installation, and the heating installation method can also be used. .

d. Thrust bearing installation The overall fit of the thrust bearing and the shaft is generally a transition fit, and the fit between the seat ring and the bearing seat hole is generally a clearance fit, so this kind of bearing is easier to install, bidirectional thrust bearing The central shaft spring should be fixed on the shaft to prevent rotation relative to the shaft. The installation method of the bearing is generally the case where the shaft rotates, so the fit between the inner ring and the shaft is an over-win fit, and the fit between the outer ring of the bearing and the bearing chamber is a clearance fit.